Best cooling results are achieved
when the air is free to circulate around items stored in the refrigerator
or freezer. When items are packed closely together, the air cools
the outermost items but the center items will not be thoroughly
cooled. Cool air never reaches the center items and they will
not be properly chilled.
May sure that air can flow over
and between the shelves as well as over the items stored there.
Overfilling the refrigerator or freezer will result in inefficient
and inadequate cooling.
An underfilled refrigerator also
will not cool as well. As items cool down, they have thermal mass;
a tendency to stay cool. When the refrigerator is empty, there
is little thermal mass and so it warms up quickly when the door
is opened.